Variable-inductance device



Tim? 9; T525 1,540,880

F. H. GUBER VARIABLE mnucmucz DEVICE Filed May 5. 1923 Z S heetS-Sheet 1 lllilmmlli IN KEN TOR Julie 9, 1925 v 1 1,540,880

F. H. GUBER VARiAELB INDUCTANCE DEVICE F1166 May 3. 1923 2 Sheets-Sheet 2 IN V EN TOR A TTORNE Y Patented une 9, I 1925.

(UNITED STATES PATENT OFFICE.

FREDERICK H. 'GUBEB, or nosELLE, NEW JERSEY.

VARIABLE-INDUCTANCE DEVICE.

Application filed May 3, 1923. Serial No. 636,289.

in the provision of a plurality of concentric rotor coils for afiording a wide range of variation in the inductance of the device. the concentric arrangement of the rotor coils affording a compact device in which exceptionally fine control may be achieved without the use of Vernier attachments.

-Another phase'of the invention resides in the provision of means cooperating'with one of the concentric rotor coils so that one of the coils is rotatedsimultaneously with the movement of the other coil, enabling the inductance of the device to be varied through a wide range by a single control member.

In its more specific aspect the invention con'lprehends a stator coil having a rotor, preferably of the ball type, mounted in its magnetic field, a second rotor-,also preferably of the ball type. is mounted within the first rotor coil, its axis preferably being disposed at substantially right angles to the axis of rotation of the first rotor. In order to secure the simultaneous rotationof the inner rotor coil with the outer rotor coil, the trunnion or spindle on Which this rotor is swivelled is connected to the stator or any other stationary part of the device or its support so that as the outer rotor is moved the spindle of the inner rotor is simulta' neously rotated therewith. In order to permit the mechanism which cooperates with the spindle of the inner rotor and the stator to move freely on rotation of the outer rotor, it is contemplated utilizing a flat spring member as the connectingelement between the spindle and the stator.

While but one embodiment of the invention is disclosed in the accompanying draw ings, it is to be understood that this embodiment merely serves as an illustration of the underlying principle of the invention so that 1t may be readily comprehended by thoseskilled in the art and is not intended as limiting the invention to the precise construction disclosed therein.

In said drawings:

- Fig. l is an elevation of the invention showing the rotors in one position.

Fig. 2 an elevation showing the rotors in another position. i

Fig. 3 is a section of Figure 1 on the line 3-3, and r Fig. 4 is a diagrammatic view of the connections between'the windings of the difierent' coils.

Continuing now by way of a more detailed description and referring more specifically to Fig. 2, a panel board Ais shown for the purpose of affording a clear understand ing of the invention although, of course the present invention is not limited in any man nor to a panel board mounting but may be equally well used in the so-called table mounting or other types of mounting. If a'panel board mounting is used the panel board is drilled in the customary manner to receive oneend of a spindle or trunnion B which has preferably mounted thereon the customary control dial C. A stator casing of any convenient shape D is provided with an opening preferably circular in which the stator coil D is mounted in the well understood manner. The shaft B has a rotor E of the ball type secured thereto so that rotation of the dial C and the spindle B will rotate the rotor E. In order to maintain the rotor in proper spaced relation with the stator a spacing washer or collar E may be inserted between the two and a cotter pin E 10- catedon the outside of the stator casing as shown. The side of the rotor E opposite to the spindle B is swivelled on pinion F mounted in the stator casing.

A second rotor coil F is concentrically mounted within the rotor E on oppositely disposed trunnions F", the axis of rotation of the rotor F being preferably arranged at right angles to the axis of rotation of the opening to prevent rotation of the spindle or trunnion, obviously other shapes of oritiee may be employed or the end of the spring might simply be soldered to the spindle. In order to provide suitable terminals or binding posts it is contemplated utilizing the spring G to form one of the connections to the rotor E and to this end the stationary end of the spring G is connected to a binding post H. A second binding post J may be preferably secured to any convenient part of the stator casing and is connected to alead J appurtenant to the apparatus with which the varioineter is intended to be used. The binding post J is also connected. by a lead K which passes through the stator casing to the stator coil or winding D. The opposite end of this stator winding is connected to the rotor E by a flexible lead of su'l'liciont length so that the rotor may be readily rotated to 180. The opposite end of the rotor E is connected to the rotor F and thence through one of the trunnions and spring G to the second binding post H to which latter an apparatus connection L is attached.

In order to set the variometer at maximum inductance the rotor E is placed so that its windings are parallel with the windings of the stator In this position of the rotor E the inside rotor F also has its windings parallel to the windings of tl e stator and are automatically brought to this position by the spring G. As the rotor E is rotated about its axis the end of the spring sweeps in an arc and rotates the spindle of the inner coil so that as the windings of the rotor E are approaching a position of minimum inductance the windings of the rotor F are also approaching a position of minimum inductance, that is the position in which the windings of the rotor coils F are at right angles to both the windings of the rotor E and the stator. This arrangement oi concentric coils moving in the manner indicated affords a wide range of variation in the inductance, the device requiring but a limited space which is very desirable in many instances, particularly in wireless telephone receivers.

It is claimed i. A variometer comprising a plurality of rotors and means operated by the movement of one of said rotors to move the other of said rotors relativly thereto.

Ii varioineter comprising a stator, a plurality of rotors and means connecting the stator and both of said rotors to move one of the rotors when the other moved.

3. A rarion'leter comprising a stator, a rotor coanially mounted therein, a second rotor mounted to rotate at substantially right angles to the first rotor and flexible means cooperating with the stator and both of said rotors to actuate one of said rotors by the movement of the other.

4%. A variometer comprising a stator and a plurality of rotors and a spring connected to each of the rotors and the stator so that movement of one of the rotors moves the other.

Signed at the city of New York, in the,

county of New York and State of New York. this 23d day of April,v 1923.

FREDERICK H. GUBER. [n s] 

